I have been using the mattress for a week, and it feels perfect. The center part is a little softer than the edge part,but I think it doesn't influence the comfort. I am planning to buy another one in the near future. Oh, I forgot to mention that the dilever is a little slower than I thought. It took 4days from setting my order to get the mattress. But that also means that it is very popular. Looking forward to the next mattress.:)